Description: The task of choice of rational set of the controlled parameters is considered at development of diagnostic consulting models. For its decision the criterion of estimation of informative value of the controlled parameter is entered in the task of differential diagnostics. The method of calculation of numeral value of criterion is offered. The got estimations can be utillized for the correction of set of the controlled parameters. The example of calculation is resulted for the special case of gauss of conditional frequency distribution of parameter casual values .
Keywords: consulting models, controlled parameter, informative value